If you are going for a more martial build, I can't help but suggest you to look into Suel Arcanamach (CArc), 5th level spells cha based casting, with an extremely sweet spell list (any wiz/sorc spell from the schools of Abjuration, Divination, Illusion and Transmutation IIRC).
Also I suggest the fighter dip, since most gishy prestige classes require proficiency with all weapons (including ranged) and/or proficiency with all armour types, on the same vein I discourage Barbarian since it's key feature (rage) doesn't mesh at all with casting
Edit: Hexblade 4 also gives access to the sweet sweet Dark Companion, which is a moving no-save debuff, if you are already going Hexblade there is no reason to skip dark companion since it is essentially free (even if you don't use save-or-x spells, which you most likely won't, your spellcasting companions will love you)
I had forgotten about Dark Companion... that would be great. I think he did specifically mention a 'gish' build, so it would be a great surprise-round debuff before he levels the spells that tells reality to sit down and shut up.
Originally Posted by The Underlord
All hail great Shneekeythulhu! Ia Ia Shneeky fthagn